When I met John in the early seventies he had a company called Film Flight and flew an Allouette doing all kinds of aerial filming, his business partner in those days was a blond lady, (name forgotten), who had been a stunt-woman.
I think I am correct in saying that John was sadly killed in an accident when his aircraft collided with some power poles or wires somewhere on the east coast of England, possibly the mouth of the River Humber?
Not a lot there I'm afraid.